Limestone-gypsum Desulfnirzaiton Absorpiton Tower Process Modeling And System Simulation

With our country attaches great importance to the problem of environmentalpollution, the power plant desulfurization is imperative. Limestone-gypsum wetFGD technology was widely used by thermal power plants with many advantages, forinstance, the high desulfurization efficiency, the mature technology, the adaptable coalchange, the absorption of the resource-rich, the cheaper price, the high frequencycomprehensive utilization of desulfurization by-products and so on.The author of this thesis studies the limestone-gypsum wet FGD technology,which is used by thermal power plants. Taking Kangping Power Plant, which coversan area of2*600WM, as the subject, the author investegated the combination ofprinciple about the technology and craft of Kangping， analyzed the factors that affectdesulfurization efficiency, created the absorber mathematical model, used theEDPF-NT system to simulate desulfurization systematically, and compared with theactual operating data of the unit. By doing all above, the author found the efficiencyof the simulation model.At the same time when the system is stable under theconditions, the author given the relationships of static simulation, dynamicdisturbance and desulfurization efficiency, and proposed an optimization program,and then laid the foundation of energy saving and desulfurizational efficiencydevelopment for the power plant. The simulation model creates the favorableconditions for flue gas desulfurization system operation and for management staff tobe trained, to learn and to set up research platform.The results of the simulation show that the desulfurization dfficiency is morethan90%when the system under normal conditions, and which increases with theincrease of the PH value. When the pH value is below5.5, the desulfurizationefficiency rapid increase with the pH value increases, but when the PH value is morethan5.5, the desulfurization efficiency increased slowly.In the case of other conditions remain unchanged, the amount of circulatingslurry affects the desulfurization, the more the circulating slurry, the higher thedesulfurization efficiency. When the circulating slurry amount is less than18500m3/h, the desulfurization efficiency increases with the amount of the circulating slurryincrease rapidly, but when the circulating slurry is more than18500m3/h, thedesulfurization efficiency increases slowly. Inlet flue gas volume affects thedesulfurization efficiency largely. The less amount of inlet flue gas, the higher efficiency of the desulfurization. When the inlet flue gas is more than420m3/s, theefficiency of desulfurization increases with the inlet flue gas volume rapidlydecreased, but when the inlet flue gas volume is less than420m3/s, thedesulfurization efficiency decreased slowly.